Konstantinos 20 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | M/L VII |
| Dates | 681 (taq) / 681 (tpq) |
| PmbZ No. | 3713 |
| Variant Names | Constantinus |
| Religion | Christian; Anti-monothelete |
| Locations | Lampsakos (Hellespontus) (officeplace); Lampsakos (Hellespontus); Constantinople |
| Occupation | Bishop |
| Titles | Bishop, Lampsakos (Hellespontus) (office) |
| Textual Sources | Constantinople, Third Council of (Sixth Ecumenical Council), ed. R. Riedinger, Concilium Universale Constantinopolitanum Tertium, ACO II.2. 1 (Berlin, 1990-1992); also cited from Mansi XI passim (conciliar) |
Konstantinos 20 was bishop of Lampsakos in Hellespontus; in 681 he attended the last session of the Third Council of Constantinople (the Sixth Ecumenical Council) (on 16 September): Riedinger, pp. 760-828 (= Mansi XI 628-680). In the subscriptions to the statement of the faith, which condemned monotheletism, and to the Council he is styled Κωνσταντῖνος ἐλέει Θεοῦ ἐπίσκοπος Λαμψάκου: Riedinger, p. 794, line 28, p. 828, line 31 (= Mansi XI 653, 680). In the list of those present at the session he is styled Κωνσταντίνου ἐπισκόπου Λαμψάκου: Riedinger, p. 760, line 7 (= Mansi XI 628).
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